Privacy-Enhancing Technologies Yang Wang Bren School of Information and Computer Sciences University of California, Irvine Donald Bren Hall 5091 Irvine, CA 92697-3440 yangwang@uci.edu (949)-351-9336 (phone) (949) 824-4056 (fax) Alfred Kobsa Bren School of Information and Computer Sciences University of California, Irvine Donald Bren Hall 5092 Irvine, CA 92697-3440 kobsa@uci.edu (949) -202-5704 (phone) (484)-762-6644 (fax) Accepted for publication in: M. Gupta and R. Sharman, eds.: Handbook of Research on Social and Organizational Liabilities in Information Security. Hershey, PA: IGI Global, to appear.